What does Castro mean by "imperialist propaganda"?

Explanation:

many in Castro Govt seen considering detente with US; popular ties with US still strong. ... This is so despite the barrage of “anti‐imperialist” propaganda directed ... or because they don't have relatives with means abroad to help them get out.

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "

its d i know cause i've been googling it