the answer is: d.was primarily concerned with westward expansion and internal problems.
At that time, the plan for westward expansion created internal debate among different groups in united states since it require large amount of investments and could bankrupt the whole country if it failed.
Because of this huge risks, united states' attention was taken mostly by this issue, to the point where we could not seriously be involved in overseas expansion.
For his domestic accomplishments. He signed executive order to prohibit racial discrimination. And he also began the process of Project Apollo as the first journey for a man to the moon.
Foreign policy accomplishments. He established the Alliance Progress that sent aid to and human rights standards to countries in Latin America that were perceived to contain communism threat.
He asked congress to create the Peace Corps. Which the Americans would volunteer. to help nations that are not developed in areas such as farming, education, health care, etc.
New technology allows scientists and others to learn more, depending on what the technology is made for.
France was upset with Great Britain because of the war they just had, so they joined America. The Revolutionary War was fought between Great Britain and America.
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