"アメリカが世界で実現しようと望むことは、まずアメリカの心の中で実現しなければならない。"

Simplified Meaning:

For America to make changes or improvements in the world, it first needs to fix those things within its own country. Imagine you want to help your friend get better grades, but you’re not doing well in school yourself. It’s hard to help them if you haven’t figured it out yet. Similarly, if America wants to promote peace and fairness around the world, it needs to make sure it has peace and fairness at home. For example, if America wants to support human rights in other countries, it has to respect and protect human rights in America first. It can’t just tell others what to do without doing it themselves. So, before trying to solve big problems outside, America needs to show it can solve those problems inside. By setting a good example at home, it shows other countries the right way to act. This advice encourages us to look at ourselves and improve from within before trying to change others.