The major causes of World War II were numerous. They include the impact of the Treaty of Versailles following WWI, the worldwide economic depression, failure of appeasement, the rise of militarism in Germany and Japan, and the failure of the League of Nations. ... Then, on September 1, 1939, German troops invaded Poland.
They were originally built as tombs for their ancestors or loved ones.
The answer is Treaty of Paris
The Fugitive Slave Law (C) required that all states help slave owners catch their runaway slaves. This law required that if a slave were to escape to a northern state where there was no slavery that the person must be returned to their "owner" in the South.