Originally a military term, refers to the newest, latest, and most advanced art. their "battle" was to advance the progress of art aginst the resistance of conservative forces

Avant-garde

Explanation:

Avant-garde is a French term. Originally, it meant the part of the army that goes forward ahead of the rest.

The term first appeared in reference to arts in France. The avant-guard started in 1850s, with the realism works of Gustave Courbet.

Avant-garde artists are considered to be ahead of  their time, they crate radical or experiential works of art and are non-traditional.

Some avant-garde movements are cubism, futurism or surrealism.

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average