No country on this planet has survived a full blown ice age. Not one. That’s the facts.
The Maunder Minimum does not produce a full blown ice age....whatever the heck that is. The Maunder Minimum produces what is called a mini ice age.....that has extreme cold and long winters but glaciation is not as great
Since a time with severe glaciation is much longer than recorded history there is no way to know if people survived.
All countrys survived ice ages else earth would have no dry land