You answer would be Philadelphia
Answer:
I believe it was malaria, but correct me if I'm wrong.
Explanation:
The control of malaria was essential for the construction of the Panama Canal. The discovery that malaria was transmitted by mosquitoes had an immense impact on development programs in the tropics.
Answer:
It allowed African Americans the opportunity to vote in primary elections, which weakened white supremacy
Explanation:
Britain and France were hesitant to support the confederacy until they could collaborate in supporting the Confederacy. France was particularly hesitant until the British could join in. This did not happen and the two countries remained neutral throughout the American Civil War