Q2. "[I] am trying to find out if presidential
elections are held during war?"
There is nothing in the Constitution that addresses this question directly,
which essentially means that elections must be held as spelled out elsewhere
(Article 1, Section 2, Article 1, Section 3, Article 1, Section 4, Article 2, Section 1, and Amendment 17). We can also look at history and see
that elections have been held many times during wars, both declared and
undeclared: 1812 (War of 1812); 1864 (Civil War); 1900 (Philippine-American
War); 1944 (World War II); 1952 (Korean War); 1964, 1968, 1972 (Vietnam War);
2004 (Second Gulf War). A list of all election
results is available at this site.