Short answers, pulled from the story.
The United Kingdom and France occupied and governed the Territory of the Saar Basin under a League of Nations mandate. A five-person Governing Commission administered the region with full legislative power without local input.
A plebiscite held on the 13th of January 1935 determined the fate of the Territory of the Saar Basin. Voter turnout reached 98% as citizens cast their ballots on whether to re-join Germany or retain foreign rule.
The population of the Territory of the Saar Basin reached 812,000 people by 1933. Residents were concentrated around the capital city of Saarbrücken and included miners working in the coalfields ceded to France.
The Regional Council counted thirty members but possessed no legislative power despite being an elected assembly. The council formed on the 24th of March 1922 after four years without official representation.
Germany reintegrated the region into the German Reich on the 1st of March 1935 following League Council approval on the 17th of January. Adolf Hitler sought propaganda advantages from this return while Joseph Goebbels designed a concerted campaign.