acordung to the constitution, hiw often is the numer of congressional districts per state determined?
http://www.usconstitution.net/constnot.html#condist
which branch of government establishes lower federal courts?
http://www.usa.gov/Agencies/Federal/Judicial.shtml
According to the United States Constitution, the number of congressional districts per state is determined every 10 years through a process called apportionment. This process is based on the decennial census, which counts the population of every state in the country.
To determine how often the number of congressional districts is determined, we need to refer to the Constitution. Specifically, Article I, Section 2, Clause 3 of the Constitution states that "Representatives shall be apportioned among the several States according to their respective Numbers, counting the whole number of persons in each State, excluding Indians not taxed."
This clause implies that the number of congressional districts is determined based on the population of each state. Therefore, it is required to conduct a census every 10 years to count the population. The data from the census is then used to reapportion the number of congressional seats among the states based on changes in population.
So, to summarize, the number of congressional districts per state is determined every 10 years as a result of the decennial census conducted under the constitutional provision of apportionment.