What is the difference between polygamy and polyamory?

What is the difference between polygamy and polyamory?

What is the difference between polygamy and polyamory? 150 150 Peter

Watch the following video on contemporary Polygamy:

Then watch this video on Polyamory

Write a 500-word response that addresses the following questions. What is the difference between polygamy and polyamory? How does this relate to monogamy? Do you think polygamy should be illegal? Is monogamy on the decline?