Bandleader propaganda is used if a politician tells you that "everybody is joining his team."
a. true
b. false

The answer is false.  The proper term is bandwagon propaganda.  This is when a person is being persuaded to accept or join a certain campaign or group especially when it is popular and everyone has joined the movement.  Sometimes they pressure people to join in the group or movement.

They are called independent

It should be at the center of any map going vertically: the prime meridian, as it passes through greenwich,  england, is considered 0 degrees longitude