Miguel hidalgo's "grito de dolores" called for mexicans to rise up against french rule.

False, although Miguel Hidalgo's "Grito de Dolores" called for Mexicans to rise up, it was against Spanish rule and not against French rule. This is considered as the event that started the Mexican War of Independence and is called the "Grito de Dolores", because this translates as the Cry of Dolores, the small town in which the call to revolt was uttered.

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