Explain why it took 100 years after the end of slavery for the U. S. Congress to pass a law outlawing racial discrimination. 3 key main ideas as to why

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.

by 1880, germany had more rail lines than great britain and russia.

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: