Answer:
B. Militarism
Explanation:
Through the process of elimination:
Alliances are based on certain powers helping each other, nationalism is a strong sense of loyalty and pride for one's nation, and imperialism is the act of conquering a land to expand an empire. :)
The concept of militarism:
Basically a strong sense that a group of people or nation should establish and maintain a strong military, which is used for the nation's interests, war, defense, and more.
Opposition increased over time because american citizens had kept seeing the results of the war. For example, like increased funding, many deaths, and lost a lot of battles. As the war continued and the US was not progressing any in defeating North Vietnamese forces, Americans began to view the fighting as pointless due to all the consequences. I believe it was justified, because the outcomes could have been avoided if peace with Vietnam was settled earlier or if the US didn't even get involved.
Are you asking when Texas become a state?
Adams had to work hard to win the people's trust because they already adored Washington when he became president