There are a multitude of synonyms for the phrase "was the case," depending on the context in which it is being used. Some options might include "proved to be true," "turned out to be," "was confirmed," "was the reality," "was the situation," or "was the circumstance." Other phrases that could be used interchangeably might include "was the fact," "was the truth," or "was the case in point." Ultimately, the most appropriate synonym will depend on the tone and purpose of the original sentence, and careful consideration should be given to selecting the right replacement for optimal clarity and effectiveness in communication.