This is a complex question with the short answer being that they can but often do not.
Primaries, by their nature, put politicians through the ringer and make it so that their ideas are vetted by different types of citizens as they go along.
Our primary system has some flaws though, primarily that the early primaries are dominated by rural states.
So, candidates who may appeal to more citizens are often knocked out early because they may not appeal to white voters in New Hampshire and Iowa.
The counter to this argument is that the candidate that makes it through is the best candidate simply because they made it through the gauntlet of the American people. As a result, they represent a broad coalition.
The United States was not prepared for the war. Even though Americans had those enthusiastic spirit, they desperately lacked military strength. The United States Army was not prepared and aware.
They were understaffed, under equipped and under trained. The United States emerged as a world power after the result of victory over Spain in Spanish American War.
The United States gained possession over Guam, Puerto Rico and Philippines after the war. They also gained temporary control of Cuba. The United States also annexed the independent state of Hawaii during the conflict.
2. People wanted to break free from the Soviet Union and communist rule.
People wanted to break free from the Soviet Union and the communist rule is the statement best explains the existence of resistance movements in Eastern Europe, as the population was suffering because of the regime, and so they began to build a network that would lead them to resistance toward the communist governments.