Two things that challenged the confederacy were diseases and population disadvantage.
Diseases challenged both sides and killed more soldiers than the battles themselves.
The other challenge was that the North has more soldiers, because the North has more people. So the Confederates were outnumbered.
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Answer:
"War of 1812" would be the best option from the list in terms of an undeclared war, since there was never a truly formal start to the hostilities--it just began when the British started taking American sailors by force. There was an official end, however.
Explanation:
The ten largest troop (including police and military experts) contributing countries to UN peacekeeping operations as of May, 2017 were Ethiopia (8229), India (7665), Pakistan (7135), Bangladesh (6958), Rwanda (6256), Nepal (5158), Burkina Faso (2969), Senegal (2847), Ghana (2751), Indonesia (2719).
George washington on the $1. abraham lincoln on the $5. alexander hamilton on the $10.