Ameliorate Indian Removal

Directions: Grammatically correct the sentences below, in red. There is a missing SEMI COLON ( ; ) a missing COLON ( : ) and SEVEN missing commas. The suggested correction is at the bottom of the page.
The Indian Removal Act was signed into law by President Andrew Jackson on May 28 1830 it effected many tribes Sac Fox Chicasaw  Choctaw  Cherokee  Creek  and Seminole.

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suggested answer: 
The Indian Removal Act was signed into law by President Andrew Jackson on May 28, 1830; it effected many tribes: Sac, Fox, Chicasaw, Choctaw, Cherokee, Creek, and Seminole.