Why did people migrate from rural to urban at the turn of the 20th century

Explanation:People migrate from rural areas to industrial cities to Britain. They do so in order to get better opportunities. Gradually more and more people are moving to the industrial cities so that they can get good jobs and earn more. Good jobs also helps in improving the standard of living

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:

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.