It’s a quote from the farewell address of President Eisenhower.
https://en.wikipedia.org/wiki/Dwight_D._Eisenhower%27s_farewell_address
Probably goes some way to outlining the split in America as he was a Republican who the Republican Party now stands almost entirely against, having learned that social politics is a fast track to political power and riches.
It’s hard to explain how a country of ~400 million lets this happen, but the short version is propaganda and lies. And unfortunately those aren’t limited to the US.