Travel in North American can be a confusing and convoluted affair, what with all of the damaged rail lines, varied documentation and legal requirements, and of course diplomatic status between the countries. When it comes to actually immigrating to one of the countries in North America it is the diplomatic status of the country of origin with the destination that has the greatest impact.
United States - Shortly after the War Between the States, each state began to pass their own immigration laws. In 1875, the U.S Supreme Court ruled that immigration is a Federal matter, leading to the passage of the Immigration Act of 1879 and creation of the Bureau of Immigration within the Treasury Department. The security of the borders and in and out of the United States is maintained by men and women called United States Immigrant Inspectors, located in every major entry point into the United States. Small ports of entry and the border itself is monitored by the US Marshal Service.
Republic of Texas - The Travel Act of 1873 requires anyone entering the Republic to have identity papers with descriptive lists issued by the Department of State or equivalent of their country of origin. Every entry point into the country has Special Agents of the Texas Ranger Special Forces to inspect the papers of all inbound travelers. Immigrants from Mexico are usually seeking to escape the Empire and get assistance from patrolling Rangers on the Texas side of the border. Once interviewed, and inspected if they stay in Texas they are monitored for 5 years after entry.
British Dominions - Canada and California have tightened security since the Second American War due to continued hostility with the United States. Like the Republic of Texas they require all travelers to have identity papers. Immigration from the United States is currently not permitted without approval of government officials from both nations. As a result most immigrants travel from Europe or via the Disputed Territory.
Commonwealth of Deseret - Open immigration policy for all Mondominant believers.
Confederate States - Each state is developing its own immigration policy based on the needs of the state. Nationally, the Frontier Rangers patrol the border between the United States and the Confederate States as well as act as tax agents collecting tariffs from travelers.
Empire of Mexico - Unofficial travel across the border between Mexico and Texas is always denied. However, the border is long and not well patrolled on the Mexican side so those seeking to escape find ways across fairly easily. Visitors and immigrants are required to enter via one of the ports on the Gulf of Mexico or the Pacific Ocean.