The answer is actually Complex drainage systems to keep structures from flooding.
Answer:
The main reason the United States got involved in Korea was the purpose of doing everything possible to keep communism from spreading around the world. Explanation: hope it helps
Lack of expenses.
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Answer:
The Thirteenth Amendment—passed by the Senate on April 8, 1864; by the House on January 31, 1865; and ratified by the states on December 6, 1865—abolished slavery “within the United States, or any place subject to their jurisdiction.”
New inventons that changed American society during the late 1800's are steam power and electricity. The railroad helped expand the U.S.. The telegraph, the telephone, and the typewriter brought people together that were far away.