Final answer:
Two pieces of evidence that prove amending the U.S. Constitution is difficult are the requirement of a two-thirds supermajority in Congress to propose amendments and the necessity of three-fourths of state legislatures to ratify them, as well as the historical record where only 27 out of over 10,000 proposed amendments have been ratified.
Step-by-step explanation:
Amending the Constitution is challenging due to the high thresholds required for both proposing and ratifying amendments. First, the proposal of an amendment itself demands a supermajority, with two-thirds of both chambers of Congress needing to agree. Alternatively, two-thirds of state legislatures can call for a convention to propose amendments, though this method has never been successfully used. Secondly, the ratification process is equally stringent, requiring the consent of three-fourths of the state legislatures to adopt the change, further demonstrating the difficulty involved.
Another piece of evidence that proves amending the Constitution is difficult is the historical record of proposed amendments. Despite over 10,000 proposed amendments throughout American history, only 33 have secured the necessary two-thirds approval in Congress, and of those, only 27 have been ultimately ratified. This showcases the significant challenge in both proposing and finalizing amendments to the Constitution.