The fourth quarter of 2020 was as busy as you imagined, with super late-stage startups reaching new valuation thresholds at a record pace, and total venture capital funding in the United States recording its second-best result of all time. That’s according to data released recently by CB Insights, which complements our look back at 2020’s venture capital year in America from yesterday. At the time, we noted that American startups raised an average of $428 million each day last year, a sum that helps illustrate how rapid the private markets…