In early 1938, Austrian Nazis conspired for the Hitler broke the Versailles Treaty by rebuilding Germany's army.

On September 27, seeing that Czechoslovakia was in dire straits with Nazi troops readying to invade, Poland issued an ultimatum, demanding that Czechoslovakia hand over its Tesin (Teschen) district. Following the annexation of Czechoslovakia, Poland was already partially surrounded by German controlled territories by 1939.

The leaders of Britain , France, Italy, and Germany held a conference in Munich on September 29–30, 1938. Czechoslovak history - Czechoslovak history - Czechoslovakia (1918–92): When the new country of Czechoslovakia was proclaimed on Oct. 28, 1918, its leaders were still in exile. The League did nothing. Masaryk was chosen as president on November 14, while he was still in the United States; he did not arrive in Prague until December. Which country did Hitler invade after he took Czechoslovakia and made the pact with Stalin? Czechoslovakia is partioned into two: Czech (annexed by Germany) & Slovakia (puppet state of Germany). On 15 March 1939, German troops marched into Czechoslovakia. (Germany) (Italy) 2. The Germans demanded that Lithuania give up the Klaipėda Region (also known as the Memel Territory) which had been detached from Germany after World War I, or the Wehrmacht would invade Lithuania. In 1936, he sent troops into an area along the Rhine River between Germany and France that the treaty had forbidden the Germans to enter. On March 12, 1938, German troops march into Austria to annex the German-speaking nation for the Third Reich. Poland, Norway and Finland were taken after Czechoslovakia was taken by the Nazis in 1938. In response to Hitler’s annexation of Czechoslovakia in March 1939, the British pledged military support to Poland in the case of an attack from Nazi Germany. In anticipation of the invasion, the Soviet Union had moved troops from the Soviet Union, along with limited numbers of troops from Hungary, Poland, East Germany and Bulgaria into place by announcing Warsaw Pact military exercises.
As such, it was in a geographically weak situation. Germany launched the invasion of Poland on September 1, … The French and British again responded with appeasement--giving in to keep the peace. The Warsaw Pact invasion of August 20–21 caught Czechoslovakia and much of the Western world by surprise. The 1939 German ultimatum to Lithuania was an oral ultimatum which Joachim von Ribbentrop, Foreign Minister of Nazi Germany, presented to Juozas Urbšys, Foreign Minister of Lithuania on 20 March 1939.
They took over Bohemia, and established a protectorate over Slovakia. 1) the mountainous region formed Czechoslovakia's defense against Germany attacks 2) Hitler wanted to annex Czechoslovakia in order to create more living space for Germany 3) It would help Hitler to control Czechoslovakia's important recourses like Uranium and Coal. The Sudetenland was a border area of Czechoslovakia containing a majority ethnic German population as well as all of the Czechoslovak Army's defensive positions in event of a war with Germany.