People sought to spread their religion to others so they traveled to new places to do that.
<span>The first of the Crusades began in 1095, when armies of Christians from Western Europe responded to Pope Urban II's plea to go to war against Muslim forces in the Holy Land.</span>
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On June 22, 1941, Nazi Germany launched a surprise attack against the Soviet Union, its ally in the war against Poland. By the end of the year, German troops had advanced almost 1,000 miles to the outskirts of Moscow. Soon after the invasion, mobile killing units began the mass murder of Soviet Jews. German military and civilian occupation policies led to the deaths of millions of Soviet prisoners of war and Soviet civilians.
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The Battles of Lexington and Concord, fought on April 19, 1775, kicked off the American Revolutionary War (1775-83). Tensions had been building for many years between residents of the 13 American colonies and the British authorities, particularly in Massachusetts. On the night of April 18, 1775, hundreds of British troops marched from Boston to nearby Concord in order to seize an arms cache. Paul Revere and other riders sounded the alarm, and colonial militiamen began mobilizing to intercept the Redcoat column. A confrontation on the Lexington town green started off the fighting, and soon the British were hastily retreating under intense fire. Many more battles followed, and in 1783 the colonists formally won their independence.