What situations in Germany allowed for the growth of the Nazi party?

Before the onset of the Great Depression in Germany in 1929-1930, the National Socialist German Workers' Party (or Nazi Party for short) was a small party on the radical right of the German political spectrum. In the Reichstag (parliament) elections of May 2, 1928, the Nazis received only 2.6 percent of the national vote, a proportionate decline from 1924, when the Nazis received 3 percent of the vote. As a result of the election, a "Grand Coalition" of Germany's Social Democratic, Catholic Center, German Democratic, and German People's parties governed Weimar Germany into the first six months of the economic downturn.