The answer is 
B. Spain and the U.S. signed the Adams-Onis Treaty 
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Answer:
For example Al-Razi (Rhazes), who ran the Baghdad hospital in the late 800s and early 900s, was the first author known to have written a book about children's diseases. He also explained the difference between smallpox and measles: this helped doctors diagnose the diseases.
Explanation:
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Answer:
<em>Slavery was so profitable, it sprouted more millionaires per capita in the Mississippi River valley than anywhere in the nation. With cash crops of tobacco, cotton and sugar cane, America's southern states became the economic engine of the burgeoning nation. Their fuel of choice? Human slavery. Under the law, an enslaved person was treated as property and could be bought, sold, or given away. Slavery lasted in about half of U.S. states until 1865. As an economic system, slavery was largely replaced by sharecropping and convict leasing.</em>
<em>Slavery had been practiced in British America from early colonial days, and was legal in all thirteen colonies at the time those colonies formed the United States. Under the law, an enslaved person was treated as property and could be bought, sold, or given away. Slavery lasted in about half of U.S. states until 1865.The first 19 or so Africans to reach the British colonies arrived in Point Comfort, Virginia, near Jamestown, in 1619, brought by British privateers who had seized them from a captured Portuguese slave ship. Slaves were usually baptized in Africa before embarking.</em>
Just one month after writing this letter, Lincoln issued his preliminary Emancipation Proclamation, which announced that at the beginning of 1863, he would use his war powers to free all slaves in states still in rebellion as they came under Union control.
 
        
             
        
        
        
Option A, The United States was in a period of demobilization after WWI.
<u>Explanation:
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The 1918-20 recessions were a severe deflationary contraction from 14 months after World War I. The depression was not only severe; the deflation was large compared to the subsequent downturn in the actual product, in the United States and in other nations.
After Armistice Day, short depression in the United States was accompanied by a rise in production. Nevertheless, the 1920 depression was also caused by the post-war changes, especially the demobilization of troops.
The reintegration of soldiers into the civilian labor force was one of the main changes. There were 2.9 million people working in the Military in 1918. This declined in 1919 to 1.5 million and in 1920 to 380,000. 
It was 1920 when civilian labour rose by 1.6 million or 4.1 percent in one year, and the effects on the labor markets were most startling. (This is the highest one-year rise in labor force, although it is lower than the figures during the sub-World War II demobilization in 1946 and 1947)