Don't really get it all. Don't think I want to. Thanks for showing I think or not. Satire and in this case me.
Think of them as a mailable political cartoons or editorial cartoons. Below are two modern examples but first here who is shown on the postcards:
Guillaume II the son of Emperor Frederick and Empress Victoria, the grandson of Wilhelm I of Hohenzollern on his father's side and Queen Victoria of England on his mother's, was born in Potsdam on the 27th January 1859. Had political interactions with France.
Pope Pius X
M. Brisson, President of the French Chamber
M. Combes, succeeded Waldeck-Rousseau as premier in 1902 and agreed to laws exiling almost all religious orders from France and dismantling major aspects of the church's public functions, especially in education. He started as seminarian in his youth, Combes published his doctoral thesis, La Psychologie de saint Thomas d'Acquin, in 1860, but before ordination he left the church.
not posted pre1920 postcards
As the Pope died in 1914, you can roll your dating back a few years.
Edited for "s" two of them.