why would certain groups & people’s around the world prefer to keep their own calendars & not switch to a global unified calendar?

the exclusive possession or control of the supply or trade in a commodity or service.

a they donate money to humanitarian causes

c   they volunteer to alleviate suffering

d   they blame all muslims for not being able to keep their fellow muslims in line.

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv

islam spread slowly through much of africa through trade and preaching.