Answer:
The Republican Party is also known as the GOP meaning "Grand Old Party" or "Galland Old Party", and albeit is not the oldest political party in America, the idea of "Old Party" is entrenched in the more recent advocacy for keeping old traditions, and the continuation of old ideas, turning them into being conservatives, but in recent times since that party encouraged and supported progressive ideas in the past; thereby, that's why nowadays "Republicans are most often associated with having conservative ideas".
Step-by-step explanation: