Does the monroe doctrine still exist today? if so, what role does it play on the war on terror?

The Monroe Doctrine still exists today.

Explanation:

Named after President James Monroe, it was a policy that began around 1823 and was against European imperialism in either North or South America.

The Doctrine viewed any European colonial attempts in the Continent as an act of aggression against the United States.

This eventually gave way to the popular description of South America as United States 'Backyard'.

To this day, United States heavily guarded this policy and ensures that all affairs in South and North America are heavily influenced by the country.

However, the doctrine itself has had no impact on the so-called War on Terror.

Hard question depend on which century and in which social class through medieval era climate was wamer and due to many advantages ina griculture and early industrail revolution (or as some historians say medieval industrail revolution) most of harvest were good and profitable, due to demographic and economic boom popualnce rose high so i would say that worst  nuisance was that in any region and in any century there was moment when sistuation led to overpopualnce and that would made an economci and social rpoblems which led to migration, other would be a plague in some area but we must remeber that during medieval era there was only one pandemic on continental and global sclae balck death which killed mroe than a third of european popualtion