Which area of north america is the ancient plano culture associated with?

The Great Plains.

Explanation:

Plano Culture was a society of hunter-gatherers who lived during the Paleo-Indian period on the great plains of North America, specifically Canada and the United States of America.

This society is characterized by the use of sharp tools called Plano points. For this reason, archeologists call these societies plano culture.

so, based on the research i've done. the u.s. government were always on a wild goose chase just to take down castro. he then retired his trone to his brother raul in 2008 due to some health issues. so it's obvious your answer would be:

castro had no allies from which he could receive aid.

hope this and have a fantastic day!

                                                    -wolfiewolffromsketch