In the 1500s, when Spanish conquistadors appeared, two vast empires, those of the Aztecs and the Incas, dominated Central and South America. Both possessed divine kings, both were fractured by internal dissent, and both quickly succumbed to the Spanish onslaught. The physical remains of all these cultures lay dormant for centuries, until science and curiosity demanded their exploration.

How could the Americans ever hope defeat the mighty British Empire in a military conflict? Americans faced seemingly impossible obstacles. When the guns fired at Lexington and Concord in 1775, there was not yet even a Continental Army. Those battles were fought by local militias. Few Americans had any military experience, and there was no method of training, supplying, or paying an army.

The British seemed unbeatable. During the previous 100 years, the British had enjoyed triumph after triumph over nations as powerful as France and Spain. At first glance, the odds were clearly against the Americans. A closer look provides insight into how the underdogs emerged victorious.

The Maya were a collection of people clustered in city-states. What united them was an idea. For the Maya the world of ordinary living and the Otherworld populated by gods, ancestors, and monstrous things, were equally real. There existed three regions, intricately bound together: the heavens, the earth, and the waters of the Underworld.

In the past 25 years archaeologists have learned to read what the Mayas wrote. Today we know the names of kings and queens, how they lived, and when they died, transforming our view of Maya culture.

It is impossible to know the exact number of American colonists who favored or opposed independence. This section discusses attitudes toward the American Revolution in the colonies

The Inca called their empire Tahuantinsuyu, or Land of the Four Quarters. It stretched 2,500 miles from Quito, Ecuador, to beyond Santiago, Chile. Within its domain were rich coastal settlements, high mountain valleys, rain-drenched tropical forests and the driest of deserts. The Inca controlled perhaps 10 million people, speaking a hundred different tongues. It was the largest empire on earth at the time. Yet when Pizarro executed its last emperor, Atahualpa, the Inca Empire was only 50 years old.

On the night of June 16, 1775, a detail of American troops acting under orders from Artemas Ward moved out of their camp, carrying picks, shovels, and guns. They entrenched themselves on a rise located on Charleston Peninsula overlooking Boston. Their destination: Bunker Hill.

Huitzilopochtl, God of the Sun, was the Aztec principal god. He had an insatiable appetite for blood. Under his urging, the Aztecs rose from a band of primitive farmers to become the bloodiest civilization of the early Americas. Many Central America cultures indulged in human sacrifice. The Aztec practiced it on an industrial scale, sacrificing tens of thousands of victims each year.

In the wake of Columbus' historic voyage in 1492, expeditions, especially from Imperial Spain, swarmed into Aztec territory. They came in search of gold and souls — gold to enrich the coffers of the Spanish king (and their own), and heathen souls to rescue for Christianity. Within a generation, America's ancient civilizations were crushed. Both the Aztec and Inca Empires collapsed after campaigns lasting just a couple of years. How did they fall so fast? Historians suggest many causes.

During the war years, those Americans not involved in warfare were doing their best just trying to survive. Farmers continued to grow food, artisans continued to practice their trades, and merchants attempted to maintain their businesses. Despite efforts to maintain business as usual, the entire social landscape was changed.

At Valley Forge, there were shortages of everything from food to clothing to medicine. Washington's men were sick from disease, hunger, and exposure. The Continental Army camped in crude log cabins and endured cold conditions while the Redcoats warmed themselves in colonial homes. The patriots went hungry while the British soldiers ate well.

The Battle of Saratoga was the turning point of the Revolutionary War. The scope of the victory is made clear by a few key facts: On October 17, 1777, 5,895 British and Hessian troops surrendered their arms. General John Burgoyne had lost 86 percent of his expeditionary force that had triumphantly marched into New York from Canada in the early summer of 1777.

Nowhere was the victory at Saratoga more noted than in France, which had been tentative in its efforts to assist the Americans. France's interest in the American fight for independence stemmed from France's humiliating defeat during the Seven Years War at the hands of its ancient enemy, England.

Although the American military was still enduring losses in 1780, the French were making a difference. The French navy was disrupting the British blockade. French commanders such as Lafayette and Rochambeau earned the respect and admiration of the American troops.

Liberty, republicanism, and independence are powerful causes. The patriots tenaciously asserted American rights and brought the Revolution. The Revolution brought myriad consequences to the American social fabric. There was no Reign of Terror as in the French Revolution. There was no replacement of the ruling class by workers' groups as in revolutionary Russia. How then could the American Revolution be described as radical? Nearly every aspect of American life was somehow touched by the revolutionary spirit. From slavery to women's rights, from religious life to voting, American attitudes would be forever changed.

Life, liberty and the pursuit of happiness simply did not seem consistent with the practice of chattel slavery. How could a group of people feel so passionate about these unalienable rights, yet maintain the brutal practice of human bondage? Somehow slavery would manage to survive the revolutionary era, but great changes were brought to this peculiar institution nevertheless.

During the colonial era, Americans were bound by British law. Now, they were no longer governed by the Crown or by colonial charter. Independent, Americans could seek to eliminate or maintain laws as they saw fit. The possibilities were endless. Republican revolutionary sentiment brought significant change during the immediate postwar years.

Every society needs a set of rules by which to operate. After the colonies declared independence from Great Britain, they had to write their own constitutions. Impassioned with the republican spirit of the Revolution, political leaders pointed their ideals toward crafting "enlightened" documents. The result was thirteen republican laboratories, each experimenting with new ways of realizing the goals of the Revolution. In addition, representatives from all the colonies worked together to craft the Articles of Confederation, which itself provided the nascent nation with invaluable experience.

Public education is the single largest expenditure for state and local governments across the nation. Yet it is arguably the most criticized. Many people charge that public schools are faltering and that American academic achievements are far behind those in other countries. In recent years, many states and localities have experimented with improving public schools.