Which amendment gave the federal government the ability to tax the incomes of its citizens?

Are people more motivated to change from positive or negative experiences, like slavery, womens rights, and any other historical movements/moments? i need more factual information than opinions.

Open opinion / / / should juveniles spend life in prison? why? or why not?

What is your cultural heritage? what nonverbal behaviors are typically associated with your cultural heritage? which of those behaviors do you display? how might studying other cultures you be a competent communicator?