States with major desert areas:
Arizona
California
Nevada
New Mexico
Texas
Utah
Colorado
The following states have major desert areas:CaliforniaNevadaArizonaNew MexicoTexasColoradoUtah
The following states have major deserts in parts of their territory: California Nevada Arizona New Mexico Texas Colorado Utah
California Nevada Arizona New Mexico Utah Colorado Texas
Californi., Nevada, Arizona, New Mexico, Texas, Colorado and Utah all have parts of one or more deserts within their boudaries
The following states have major desert regions: California Arizona Nevada New Mexico Texas Utah Colorado
There are at least 24 major deserts in the world and a number of smaller deserts.
California Nevada Arizona New Mexico Texas Utah Colorado
DESERTS
European countries have the least amount of deserts.
The least people live in the deserts in the South or on the mountains.
There are at least 10 deserts in the Americas and each has its particular statistics. If you provide a particular desert, perhaps your question can be answered.
I count 20/50 = 40% of the states were birthplaces of at least one President. I included South Carolina as the birthplace of Jackson, but it is under dispute.