How do historian collect evidence from primary and secondary sources to understand the past?

Hi! Primary sources are also called original sources, such as an old document or a ancient weapon. For example, if a historian is trying to find out more about the Gold Rush and digs up an old pickaxe, the pickaxe is a primary source to finding out more about the Gold Rush.
Secondary sources are like your history textbook. Historians also use books and data already collected to support their findings. Using the example I just used, if a historian uses a book about the Gold Rush to support the theories made based on the pickaxe, he or she is using a secondary source!
Hope this helped!

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.