Was the Mexican War an Exercise in American Imperialism?

I believe that the Mexican War was an exercise of American Imperialism. Imperialism is when a country uses its force to rule over another country, which is exactly what happened with the American settlers and Mexico. Mexico emphasized the immigration of American settlers to Texas, part of Mexico at the time, along with their slaves to create a greater population of Americans. Slavery was not outlawed at that time. Later on, the Mexican government banned slavery, which caused a dilemma amongst the American settlers, who believed they had the right to keep their slaves. There was a rebellion, and the settlers overthrough the Mexican government, therefore proving the fact that the Mexican War was a exercise of American Imperialism.