ARTERIES THE KINGS INSPIRED

THE MONARCHS BUILT WIDE, STRAIGHT STREETS THAT LED THE EYE TO SYMBOLS OF ROYALTY

Haussmann generalized that model to let the army march rapidly toward radicalized areas, where they assembled in huge voids around symbols that buttressed the regime. 

Take the street that pierced through the Latin Quarter to the 13th's edge, with as point of focus a church built to promote obedience:

Adapted from a Google map

In the working-class neighborhood of the southeast

Rue Jeanne d'Arc

 Notre-Dame-de-la-Gare

As well, the arteries' width made building barricades more difficult and being long and straight allowed bombarding them... 

Internet, source unknown

...should they spring up just the same.

          "Building a Barricade on March 19, 1871" (the day after La Commune began) by Arnaud Durbec / zoom. 

-- Musée Carnavalet, not exhibited

# # # 

Here in the south, tearing down a slum sufficed to build an artery. In the north, a steep hill made such construction impossible, with confounding results (more later). In the wealthy, conservative west, there are no such designs.

In the east, 

a canal brought a problem. 

*    *     *

Next,

A canal is covered over