Final answer:
The passage of the Civil Rights Act of 1964 provides evidence to support President Obama's assertion that "America became more free and more fair".
Step-by-step explanation:
The evidence that supports President Obama's assertion that "America became more free and more fair" is the passage of the Civil Rights Act of 1964. This legislation outlawed discrimination based on race, color, religion, sex, or national origin, and significantly advanced the cause of equality in America. It directly addressed racial inequalities and paved the way for further progress in civil rights for various marginalized groups.
Learn more about Civil Rights Act of 1964