Which of the following was hitler’s first violation of the treaty of versailles? the german invasion of poland, the german invasion of czechoslovakia, the german invasion of the rhineland, the german invasion of manchuria

The correct answer is the third: "the German invasion of Rhineland".

Treaty of Versailles oficially ended World War I in 1919. The two parties were, on the first hand the victorious Allies of World War I or Entente Powers ( France, Great Britain and Russia) and, on the other hand, Germany which was the largest potency among the defeated.

The treaty involved several territorial agreements and war reparations that were supposed to be paid by Germany to the Allies as a compensation for the damage caused.

The treaty was broken by Germany in 1936, when Hitler decided to stop paying the debt and invaded Rhineland, which had become a demilitarized area after WWI according to the Treaty of Versailles.

the event is known to be the soviet union.