"Led to" is a frequently used phrase in writing, indicating a causal relationship between two or more events or actions. However, there are plenty of other phrases that can be used as synonyms for this phrase to express the same meaning. For instance, you could use "resulted in", "brought about", "caused", "provoked", "sparked", "triggered", "instigated", "initiated", "precipitated", "propelled", "set off", or "brought on". All of these phrases suggest a correlation between actions or events that lead to a particular outcome, and can be substituted for "led to" to make your writing more varied and interesting.