(MC)Which statement summarizes changes in Constitutional principles that took place in the 1960s? The powers of police and prosecutors were expanded.
The rights of the accused were expanded significantly
Abortion rights were announced and increasingly protected.
States' rights to void federal regulations were increasingly strengthened.

The rights of the accused were expanded significantly

Explanation:

Famous cases that brought about these constitutional changes are those of Miranda v Arizona (1966) and Gideon v. Wainwright (1963). In all these cases, the Supreme Court decided that:

1. the accused had the right and must be notified of his right to counsel (a lawyer) at the time of his/her arrest.

2. the accused must be notified of his/her right not to answer any questions that might produce evidence against him.

under god i have placed my chiest strentgh and the safe guard to my loyal subjects