What steps do historians take to study history?

A primary source is something written or created by a person who saw a historical event. Letters, diaries, speeches, and photographs are examples of primary sources. Artifacts such as tools are also primary sources. Other tools that historians use are secondary sources.

Explanation:

after defeating german forces in north africa allied leaders turned their attention to "italy," since this was the location that made the most geographic sense before invading northern europe via france.