The people who engaged in the political revolution wanted war because they thought war would unify the country. The had a desire to spread ideas of the Revolution to all of Europe.
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In the case of Mexican History, it was Lazaro Cárdenas.
Step 1: An idea is introduced in Congress, it becomes a bill.
Step 2: Committees within Congress research, review, and approve.
Step 3: The bill is introduced to the House or Senate floors for all to review and consider.
Step 4: If approved by both the House and Senate, the bill moves to the President.
Step 5: President approves the bill and it becomes law.
They were referred to as "Royal Colonies"; it's a term with British origins means those territories not annexed yet under its control.