In 1963, the governor of Alabama, George Wallace, tried to physically stop three African-American students from registering at the University of Alabama. President Kennedy ordered the Alabama National Guard to force Wallace to move aside and allow the students to register. Why did President Kennedy take this action? A. The state judicial branch refused to comply with an executive order.
B. The state executive branch refused to comply with a federal court ruling.
C. The federal judicial branch refused to comply with a ruling by the state judicial branch.
D. The federal legislative branch refused to comply with a state executive branch decision.

a. competition with other nations.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

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.