Why do the people who live in the altiplanos have large chests and lungs?

How did regional differences in italy initially prevent unity in the new nation?

Which amendment best addresses the fears of the federalists like james madison, that rights and powers not specifically listed in the consttuition or bill of rights will not be protected in the future

The information box says that the han added 4,000 miles of wall. refer to the mileage scale. how can this be true?