"アメリカ人が自由な人間であるか奴隷であるかを決定しなければならない時が近づいています。"

Simplified Meaning:

This quote is saying that a crucial moment is coming soon when Americans will have to decide if they want to live freely or be controlled like slaves. Imagine you are at a crossroads: one road leads to freedom where you make your own choices, and the other road leads to being ruled by someone else who makes all your decisions. Just like during the American Revolution when people fought for their independence from British rule, there are moments in life where you must stand up for what you believe in. If you do nothing, you might lose your freedom and someone else will decide how you live. It’s about taking action and making important choices that protect your rights and way of life. If faced with a big decision, like speaking up against unfair treatment at work, this advice tells you to be brave and choose to fight for fairness rather than remaining silent and accepting injustice.