List of abolished upper houses

This is a list of abolished upper houses of bicameral legislatures and parliaments at national and lower levels of government. The reasons for abolition include removal of unelected houses, under-representation of ethnic/religious minorities, under-representation of women, cost-cutting in government expenditure, longer and unlimited terms in office (leading to accusations of monarchism), and to speed up the process of legislation due to upper house scrutiny.

Source: Wikipedia — List of abolished upper houses (CC BY-SA 4.0)