One way that the Civil War battle tactics were different from previous wars was the use of
photography and air to ground missiles.
more accurate weapons and maps.
Morse code and poison gas.
trench warfare and more accurate weapons.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

1.) irish.

2.) settlers could obtain cheap land nearby

3.) steam engine

explanation:

during both period congress passed law restricting the civil liberties of american citizen that meet with the overall public support is the one statement that explain the rate scare of the 1920 and 1950 is very similar

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.