Other than the fact that these states were admitted to the union between 1803 and 1858, what do they have in common?

a) they each entered the union as free states.
b) they each entered the union as slave states.
c) these states were created from land gained from the war with mexico.
d) each of these states used the concept of popular sovereignty to settle the slavery issue.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

the  equal rights amendment  (era) states: "equality  of  rights  under the law shall not be denied or abridged by the united states or by any state on account of sex." congress first introduced the era in 1923, but the campaign for ratification took off in the 1960s during the  civil rightsmovement.