The answer is: Parts that are all slightly different.
It took several years. Now, we don't know the exact number of years it took to find out what roman concrete was made of, but we do know it took several years. Hope I helped! :)
They did all the work for the Americans, so then the Americans had money to put towards building news town and inventions which then started to build our country.
Winning over the missipi river for the Union was a long process that involved the capture of new orleans and and Fort Donelson. the conguest ended up with the conquest of Vicksburg. these three region were very vital to ensure control of the missipi river, a fete that was made possible by superios water or river craft compared to the confederate forces.
