Lìshǐ shàng, qiángguó chángcháng jiānbìng ruòguó de lǐngtǔ.
Throughout history, strong states often annexed the territory of weaker ones.
Tips
usage
兼并 implies one party absorbing another and gaining full control, rather than an equal merger. In business, it is often paired with 收购 (shōugòu, acquisition) in the compound 兼并与收购 (M&A).