Who was the 40 president

Ronald Regan

Explanation:

originally an American actor and politician, became the 40th President of the United States serving from 1981 to 1989. His term saw a restoration of prosperity at home, with the goal of achieving “peace through strength” abroad.

1) union forces launched a surprise attack.

2) more confederate troops arrived by train.

3) union forces retreated.

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.