The Bosporus Strait.
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The land was cheap, so many Americans settled in Texas. Mexico tried to stop them, but they still came. Slavery was against Mexican law, but Americans brought slaves to Texas. Many American settlers and Tejanos, or Mexicans who lived in Texas, wanted to break away from Mexico. They did not like laws made by Santa Anna, Mexico’s president. The Tejanos and Texans decided to fight for independence.
The Bear Flag Revolt was a direct result of a yearning among United States citizens living in California to have their territory join the United States. The appearance in the territory by American army officer John C. Fremont spurred these citizens to rise up against Mexican rule.
Answer - Three factors fueled American Imperialism.
Economic competition among industrial nations.
Political and military competition, including the creation of a strong naval force.
A belief in the racial and cultural superiority of people of Anglo-Saxon descent.