In 1925 Hinderburg was elected President. Hindenburg appointed Heinrich Bruning as chancellor. Under Bruning, the unemployment rate rose from 2 258 000 in March 1930 to 6 031 000 in March 1932. Heinrichs' first priority was to end the reparations. (Treaty of Versailles). Bruning prepared to contemplate high levels of unemployment and the impoverishment of large sections of the population due to the world depression.
In Sept 1930, new elections catapulted the Nazis into prominance. They rose from 12 seats to 107 which made them the second largest party.
Brunings downfall came in May 1932. Hinderburgs conservative, anti-republican friends believed that Bruning had not moved the Government sufficiently far enough to the right.
France Von Papen replaced Bruning as chancellor. Schleicher was confident that Papen could be manipulated. When Papen proved too independent, Schleicher underminded him.
In March 1932 Hindenburg was re-elected as president. The NSDAP gained 230 seats in the Reichstag. The Nazi's + Communist (enemies) now had control of 52% of the Reichstag. The Weimar Republic was now dead.
On December 1932, Hindenburg appointed Schleicher as chancellor. Schleicher was unable to gain a majority in the Reichstag.
Many people turned to the Nazi's in the hope that they would prevent a communist take over.
The 'Old Right' had its own plans for doing away with democracy + returning to some form of authotarian government. The general idea of how to do this was to make use of the popularity of the Nazi's + manipulate Hitler. Schleider had badly miscalculated.
Hitler told Schleider either the Nazi's would enter the Government with him as chancellor or they wouldn't enter it at all. Hitler was supported in his ambition by Von Papen who was out for revenge against Schleider.
Hitler became chancellor on 30th January 1933. He had behind him an active and enthusiastic party that was united in its acceptance of his leadership, and a paramilitary organisation numbering hundreds of thousands. He had come to power legally, as he said he would, yet he had never been able to secure a majority of votes in the electorate or seats in the Reichstag. He was only successful because the old elites of land, industry and the army were determined to replace the Weimar decomcracy with an authotarian system. Their intrigues, especially since 1930, had opened the door. Hitler now stepped boldy through it.
Hope that helps?