Final answer:
The result of adding an upper house to the state legislator in the constitution of 1790 was the establishment of a bicameral legislature.
Step-by-step explanation:
The result of adding an upper house to the state legislator in the constitution of 1790 was the establishment of a bicameral legislature, where the legislature consists of two separate chambers, namely the lower house and the upper house. The lower house, often referred to as the House of Representatives or Assembly, typically represents the population based on proportional representation, while the upper house, often called the Senate or Council, represents specific districts or states with equal representation. The inclusion of an upper house aims to provide checks and balances within the legislative process, ensuring a more deliberative decision-making process and preventing one branch from dominating the other.