united-states
What is the process for an ordinary citizen to get a national
referendum on the ballot?
It can't be done. There are no national referendums in the United States and there is no means by which they can be held.
Many states individually provide for state initiatives, referendums, and recall votes (and sometimes even local ones), but this doesn't exist at the national level.
On rare occasions, Congress passes a law calling for a referendum on terms of its choosing in territory outside of any U.S. state, usually on the issue of whether that state shall become a state or otherwise change its legal status. The most recent one was in Puerto Rico. These also cannot be proposed or placed on the ballot by ordinary citizens, and are sometimes binding, but sometimes only advisory in nature.
- Can ordinary citizens propose national referendums?
No.
- Is there any history of ordinary citizens getting national referendums on the ballot?
No.