Explain why congress has the ultimate authority to override the president on many matters or propose amendments to the constitution

The constitution supply that an amendment may be propound further by the congress with two-thirds majority vote in both the house of representatives and the senate or by constitutional convention called by two-thirds of the state legislature. none of the 27 amendments to the constitution have been propound by constitutional convention.

Hope this helped!

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed

the answer to your question is

the treaty of hopewell