Why did President Polk and other Americans want to gain control of California?

Gold had not been discovered there yet, but Polk wanted California and its magnificent San Francisco Bay as the American gateway to trade with China and other Asian nations. Polk was worried that other nations, such as England or France, might take California if the United States did not act.

Explanation:

there were three types of british colonies: royal, proprietary, and self-governing. each type had its own characteristics. proprietary colonies, such as pennsylvania, maryland, and delaware, were basically land grants from the british government.

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montesquieu took the view that the roman republic had powers separated so that no one could usurp complete power. in the british constitutional system, montesquieu discerned a separation of powers among the monarch, parliament, and the courts of law.