explanation in the answer
The Red Scare
Central to the Cold War on the American homefront was the fear that communist spies were trying to destroy the country from within. This fear rose to a fever pitch between 1947 and 1957 during what is known as the Red Scare or the Great Fear. During this time there was a strong attempt to root out communists and communist sympathizers at all levels of society.
During this time period, the federal government and other institutions created loyalty programs. To keep their jobs, or to be hired, employees had to swear an oath of loyalty to the Constitution and to swear that they had never been a part of an organization that had advocated the overthrow of the government. They also had to swear that they would never join any such group in the future. The program went further and required hearings and investigations if someone was accused of being disloyal. Under President Truman the first loyalty program was started in 1947 - affecting federal employees and potential employees. The program soon spread to other organizations, particularly state governments, schools, and universities.
The correct answer is - hospitals.
The infrastructure of a country is a set of built objects where services are offered, and people work, or are using them in their daily lives for their activities. In the infrastructure of a country also fall the schools, colleges, and universities, roads, airports, administration buildings, factories etc. They all have someone that works in them, something that offer, and are used, to and by the general public, and the more developed the infrastructure is, it usually means that the more developed the country itself is as well.
If an economy is said to be in a period of stagnation that indicates that "<span>c. The economy is neither growing nor shrinking" since usually countries that are "healthy" will grow. </span>
meaning that it was increasingly dividing the nation along regional lines. Northerners were becoming more opposed to slavery, whether for moral or economic reasons, and Southerners were becoming more united in their defense of slavery as an institution.
The Sumerians which was an ancient civilization from Mesopotamia were believed to be the first people to make and use a wheel. This invention is vital to many conveniences we have today :)<span />