Why did americans want to acquire california

Because America at the time, felt it was their right and duty to expand across the continent to to Pacific. The US wanted California for its great port cities along the Pacific, cities such as San Francisco and San Diego. James K. Polk also wanted to gain California from Mexico because he did not want the British to claim it.

What he said

from the conditions of the working class in england by friedrich engels,the main idea is :

manchester's leaders hoped to oppress its working class to benefit factory owners.