The people shown on our currency have been there for almost 100 years. They were chosen because they had a connection with currency in the case of Hamilton. The others were popular Presidents plus Ben Franklin, who is an icon. The currency has been up-dated but the people have not been changed.
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Alexander Hamilton on the $10, Benjamin Franklin on the $100, and Salmon P. Chase on the now obsolete $10,000.
They are not all presidents, e.g. Franklin, Chase.
Benjamin Franklin - Half Dollar
Alexander Hamilton on the $10 bill, Benjamin Franklin on the $100 bill, and Sacajawea on the $1 coin.
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Alexander Hamilton on the $10, Benjamin Franklin on the $100, and Salmon P. Chase on the now obsolete $10,000.
Woodrow Wilson
The only restriction on whose portrait may appear on US currency is that it may not depict a living person. Contrary to widespread misunderstanding, there is no law or other rule limiting portraits to former presidents. Two current bills ($10 and $100) depict individuals - Hamilton and Franklin - who never served as president, and prior to 1928 numerous other non-presidents appeared on paper money.
Theodore Roosevelt does not appear on any US currency.
You should know that..............
They are not all presidents, e.g. Franklin, Chase.
Precious metals
I think that only Washington and Jefferson are the only US presidents to appear on 1-cent stamps.
Sacajawea, and the American buffalo
Benjamin Franklin - Half Dollar
Abraham Lincoln is the only president to appear on the US cent (a/k/a penny)