What was the most significant moment in the history of Ted and Victoria's relationship on How I Met Your Mother?

The most significant moment in Ted and Victoria's relationship on How I Met Your Mother was when Victoria gave Ted an ultimatum to choose between her and Robin, and Ted ultimately chose Robin.

Throughout their relationship, Ted and Victoria faced many challenges, including distance, jealousy, and Ted's feelings for Robin. However, the defining moment came in season one, when Victoria gave Ted the ultimatum to choose between her and Robin. Ted struggled with this decision for some time, but ultimately chose Robin, which led to the end of his relationship with Victoria.

Although their relationship was short-lived, Ted and Victoria's romance played an important role in the series, as it showed Ted's journey to finding the one. Their breakup was a significant moment for Ted, as it pushed him to move on and continue his search for the perfect partner.