We've already been invaded
Consider that since the inception of our republic the enemies of freedom have been trying to take us down. It did not take much imagination to understand that the only way it may happen is by subverting America from within.
Just one of many key areas of interest:
Money & The Federal Reserve.
In a letter to William Elkin, written only five months before he was assassinated, Abraham Lincoln, with enormous foresight wrote “I see in the near future a crisis approaching. It unnerves me and causes me to tremble for the safety of my country. Corporations have been enthroned, an era of corruption will follow, and the money power of the country will endeavor to prolong its reign by working upon the prejudices of the people, until the wealth is aggregated in a few hands and the Republic is destroyed.”
Baron M.A. Rothschild wrote, "Give me control over a nation's currency and I care not who makes its laws."
Thomas Jefferson wrote: "The Central Bank is an institution of the most deadly hostility existing against the principles and form of our Constitution...if the American people allow private banks to control the issuance of their currency, first by inflation and then by deflation, the banks and corporations that will grow up around them will deprive the people of all their property until their children will wake up homeless on the continent their fathers conquered."
In 1913 President Woodrow Wilson signed the Federal Reserve act.
He should have read the constitution:
Section. 8. The Congress shall have Power ...
To coin Money, regulate the Value thereof, and of foreign Coin, and fix the Standard of Weights and Measures;
... It does not say give that power over to foreign and private global bankers.
He realized later that he screwed up big-time.
I'd like to go on, but for the sake of brevity I'll just mention a few things..
Colonel Edward M. House
Council on Foreign Relations
Media Consolidation
Blackbox Voting - election watchdog