One of the greatest impacts of the _ railroad was that it encouraged settlement and stimulated tremendous economic growth in western growth

The correct answer is  Transcontinental Railroad

The Transcontinental Railroad affect westward expansion by making it easier for settlers to move west and also promoted westward expansion more than anything else.

The Transcontinental railroad encouraged settlement and stimulated tremendous economic growth in western growth

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question

the right answer is the constitution