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Dendrochronologists study tree rings to learn about past climates. Trees in temperate areas form one growth ring per year. Scientists can look at the rings and identify climate conditions during each year of the tree’s life. Scientists found long droughts in both the twelfth and thirteenth centuries. This is the same period when the Anasazi were leaving Chaco Canyon. Under normal conditions it was hard to support their villages in the harsh environment of northern New Mexico. When years of drought occurred, the densely populated Anasazi pueblos could no longer raise enough food. Other forces could have pushed the Anasazi away from Chaco as well.
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In 1957, a federal court ordered integration in Little Rock, Arkansas, public schools. Nine black children were selected for admission to Little Rock Central High School, but local police, by decision of the state governor Faubus, did not allow them to attend classes. After the Little Rock crisis attracted media attention and sparked an international outcry, President Dwight Eisenhower sent federal troops to Little Rock. On September 24, 1,200 soldiers from the 101st Airborne Division from Fort Campbell, Kentucky, were brought into the city. Soldiers accompanied the children on their way to school and guarded them in the corridors. To deprive Governor Faubus of the opportunity to continue to impede integration, the president reassigned the entire 10,000th Arkansas National Guard to Washington. From that moment, African American children began to attend classes.
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Haiti was finally able to proclaim independence with the aid of the British who scored a victory against the French force. On November 9, 1803, colonial authorities surrendered and in 1804, General Dessalines assumed dictatorial power, then Haiti became the 2nd independent nation in the Americas.
4x^2 +25 I hope this helps
