WASHINGTON — Texas Sen. Ted Cruz mused that the collapse of the brutal regimes in Cuba, Iran, and Venezuela during the next six months is “entirely” within the realm of possibility. The Republican, who sits on the Senate Foreign Relations Committee , contended to Sean Hannity on Fox News Wednesday that the US is living through a period of tremendous geopolitical opportunities, but cautioned that there’s no guarantee those regimes will fall. “We are at an extraordinary moment in history. It is