A.) <span>a scientist who helped survey the new national capital.</span>
I believe the answer is B as well
A The plows were not available yet
"<span>C.are neither assigned to the federal government nor denied to states" is the proper answer. The Constitution expressly states that laws not specifically reserved for the federal government can be enacted by the states. </span>
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Answer;
The international spread of the great depression.
The event that demonstrated the increasing connectivity of world economies during the 20th century is the international spread of the great depression.
Explanation;
The Great Depression was a world wide economic slump that began in the U.S. It then spread rapidly from the US to Europe and the rest of the world as a result of the close interconnection between the United States and European economies after World War I.
