What was one way in which African Americans helped the Revolutionary War effort? They convinced Native Americans to join the army. They joined with women's groups to write petitions. They protested the war outside British Parliament. They raised and contributed food for the army.

its D the last one

Explanation:

i took the test and got it right

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.