What financial invention was invented during the late 1920’s that became a cause of the Great Depression and has caused financial problems to this day?

1 – What financial invention was invented during the late 1920’s that became a cause of the Great Depression and has caused financial problems to this day?
2 – Did the 13th, 14th, & 15th Amendments apply to women? Why yes or why no?
3 – THE DECLARATION OF INDEPENDENCE ESPOUSES PRINCIPLES OF EQUALITY (“all men are created equal”) AND THE RIGHT OF PEOPLE TO HAVE A GOVERNMENT THAT SUPPORTS & WORKS FOR THEM. “That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their safety and happiness.”
These ideas did not originate with Thomas Jefferson and James Madison; in fact it did not originate in the U.S. at all but in Europe and not that long before the Declaration was written. Where did these ideas originate and who was the first personin modern European history to articulate it?
4 – What the Constitution Really Says About Race and Slavery” by David Azerrad https://www.heritage.org/the-constitution/commentary/what-the-constitution-really-says-about-race-and-slavery
AFTER READING THE ARTICLE ANSWER THE FOLLOWING QUESTION:
DO YOU AGREE WITH AZERRAD ? WHY OR WHY NOT?

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