這裡的part of the pack 要如何解釋呢？

During this period of rapid globalization, Japan's fast-food industry expanded 600% between 1970 and 1980, according to "Colonel Comes to Japan," a 1981 documentary directed by John Nathan.
KFC -- then known as Kentucky Fried Chicken -- was part of the pack, opening its first Japan outlet in Nagoya in 1970.
By 1981, the chain had opened 324 stores -- over 30 a year -- and made roughly US$200 million per year, according to the documentary.

全文是由說During this period of rapid globalization和特別指出當時fast-food industry的"時代在日本的情況。part of the pack是指這些眾多快餐品牌業fast-food industry之一。