After the German-Polish non-Aggression Pact, what was the broader implications for European stability?

The broader implications for European stability following the German-Polish Non-Aggression Pact indicate a significant strengthening of Nazi Germany's position in the region. The agreement, signed in 1934, allowed Germany to secure its western borders while neutralizing Polish hostilities, thereby freeing up resources and military focus towards other ambitions, particularly in Western Europe.

By fostering this relationship, Germany could pursue its aggressive policies without the immediate concern of a Polish intervention. This bolstered Hitler's confidence and facilitated his efforts to remilitarize the Rhineland in 1936 and later to annex Austria and pursue further territorial expansion. Consequently, the pact marked a consolidation of power for Germany, leading to actions that destabilized Europe and eventually contributed to the outbreak of World War II.

The other options do not capture this pivotal transition in European stability effectively. The pact did not increase military tension in Eastern Europe but rather temporarily alleviated conflict between Germany and Poland. It also did not lead to the formation of new alliances among Western powers, as countries were still wary of Germany’s intentions and did not ally in a way that counterbalanced its growing strength. Lastly, it rather undermined the authority of the League of Nations, which had been established to promote peace and