How many times has the U. S constitution been changed or amended ?

27 times

Explanation:

States must also extradite those accused of crimes to other states for trial. The founders also specified a process by which the Constitution may be amended, and since its ratification, the Constitution has been amended 27 times. In order to prevent arbitrary changes, the process for making amendments is quite onerous.

in 32-page handwritten address, washington urged americans to avoid excessive political party spirit and geographical distinctions, in foreign affairs he warned against long-term alliances with other nations. the address was printed in philladelphia's american daily advertiser on september 19, 1796

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.