500 POINTS PLEASE HELP ASAP PLEASE AND THANK YOU HURRY What was the Marshall Plan?

An alliance between the Soviet Union and its satellite nations.
The Soviet's plan to create an atomic bomb.
The U. S. plan to airlift supplies to Berlin.
A U. S. aid program to rebuild the economies of Europe after World War II.

D. A U.S. aid program to rebuild the economies of Europe after World War II.

Explanation:

eliminate individuals who opposed his rule

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.