Of what type of informal amendment are the following examples?

What principle did president truman invoke in sending u.s. troops into south korea without first asking congress to declare war?

When president johnson vetoed a law that would extend the freedmen’s bureau, congress reacted by supporting the veto and closing the freedmen’s bureau. writing a new law to show support for the black codes. overriding the veto and expanding the agency’s powers. drafting a law to prevent african americans from voting.

Then write 1-2 paragraphs describing one individual you believe has made a significant contribution to florida and united states history. in your response, explain why this individual's contribution was significant.