This comes from a popular song, Puttin' on the Ritz, written by Irving Berlin in 1929. The phrase means to dress nicely for company or a certain occasion, and derives from London's elegant Ritz Hotel.
At the time, the West feared the Soviet Union might influence the large and resource-rich Congo to become Communist and a threat to the USA.
"Civilization" was a song written by Bob Hilliard and Carl Sigman for the 1947 Broadway musical, Angel in the Wings. It was performed by Elaine Stritch.
The song is a satire sung from the perspective of a native "savage" whose village has recently been settled by a missionary trying to make the tribe "civilized". However the savage thinks differently, noting the major flaws in civilized society and ultimately deciding to stay where he is.
This is a reference to the parable of the Workers in the Vineyard, found in Matthew 20:1-16.
So the last shall be first, and the first last: for many be called, but few chosen
It is the story of a vineyard owner who hires different groups of casual labourers for different lengths of time. At the end of the day, the landowner pays them all equally, starting payments with the last person to get there. It's a story of equality and generosity, but also of entitlement because the ones who had been there longer thought they were entitled to more.