Santa Anna rejected the state constitution
The event that led to defeat at Waterloo was:
B.a Russian army strikes the final blow at the battle of Waterloo
Explanation:
The Russian army's final strike at Waterloo against the immortal guards of Napoleon which were supposed to be the old guard that never fell and then they were routed from the war leaving Napoleon himself defenseless.
This route was the final blow at the end of Waterloo's battle dealt by the Russians against Napoleon's forces and it resulted in an utter defeat on his side which Napoleon has rarely seen in his life's entire campaigns.
The best answer is C
The plan to attack France first was a plan by the German Chief of General Staff, Alfred Von Schlieffen which he came up with way back in 1905.
He decided that France was the enemy to be defeated first, with Russia held off until the French were annihilated. He worked out a detailed time timetable that took into account possible French responses to German actions. He believed that Germany would defeat France within six weeks, then after that he would turn his full force on Russia.
Schlieffen plan was heavily modified by his successor Moltke, thus during the outbreak of WWI in 1914, it was not implemented as Schlieffen had envisioned.