World War 2 was a
war.
continental
civil
global
Pls hel

so slaves can have there own rights,so the states can still be united and it would be backwards to only have 7 8 9 states

Explanation: please mark me as brainlist

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.