Too many small parties, even parties opposed to democracy could gain seats, hard for one party to gain a majority, most governments were coalitions, many Germans doubted if democracy was right for Germany
The Kapp Putsch 1920 was led by Wolfgang Kapp, with 5000 Freikorps rebelling in Berlin to overthrow the Weimar Republic, but a general strike of 12 million workers forced them to back down
Under The treaty of Versailles, Germany had to pay reparations of £6600 million, and in 1922 when Germany did not pay, French and Belgian troops marched into the Ruhr and took reparations in the form of raw materials and goods
The Dawes Plan helped Germany with paying reparations, the French agreed to leave the Ruhr, reparations were reduced, and the USA agreed loans and encouraged investment