What is the order of succession for the presidency if something should happen to the president?

1 — President of the United States
2 — Vice-President of the United States
3 — Speaker of the House of Representatives
4 — President of the Senate Pro Tempore (becomes VP when Speaker becomes President)(Cabinet Secretaries in Order of Post's Creation
5 — Secretary of State
6 — Secretary of the Treasury
7 — Secretary of Defense8 — Attorney General
9, — Remaining Cabinet Secretaries

What does this mean lol.

Britain and its empire stood alone against hitler and mussolini. in june 1941, hitler broke the non-aggression agreement with stalin and germany invaded the soviet union. in december, japan attacked the us and britain. the main lines of world war ii had formed.