Enconmienda differed from slavery in that the Spanish designed the system partly as an economic one, but also as a means of civilizing/Christianizing the indigenous peoples of Latin America and the American Southwest. Slavery, on the other hand, was purely an economic system and instead of encompassing indigenous peoples, it involved the forced relocation of inhabitants of Africa to North and South America.
An addition or change to the constitution is known as an amendment. They have to go through many stages of deliberation before becoming part of the constitution.
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Yes i 100% agree there are many more job and education opportunities in America but you are not guaranteed to succeed. Putting dedication into finding a job and working your way up will better your odds of success. everyone has different opinions on what success is but i think it means comfortably living with less worries about money, this could never be guaranteed but you have a higher probability of achieving it while living in America.