President Donald Trump is reversing Obama administration moves toward easing restrictions on travel and trade with Cuba, directing changes in ways that could make it harder for Americans to travel to the communist country and slow efforts by businesses to open up shop on the island.

Businesses that already have embarked on deals in Cuba will be allowed to continue pursuing them, although the future of U.S.-Cuba relations under Mr. Trump is likely to change. Here are five areas to watch:
Travel By far the biggest effect of Mr. Trump’s regulatory tightening is expected to fall on individual travelers, who will see stronger enforcement of laws against American tourism in Cuba. Airlines could see a drop-off in passengers as travelers face a greater burden of showing that their trips are centered on educational or other approved purposes, and that they’re not doing business with hotels or restaurants controlled by the Cuban military or intelligence apparatus. Regulations still must be developed, but Treasury officials Friday provided some initial guidance.

Agricultural and Medical Trade

Most trade with Cuba is blocked by longstanding laws put in place by Congress, and neither Mr. Trump nor Mr. Obama have changed the underlying U.S. embargo. Still, the law allows for agricultural and medical exports to Cuba, and the U.S. has sent $83.4 million in goods to Cuba in the first four months of this year. Farmers see big potential in selling rice, poultry and other products to Cuba, but those sales still aren’t practical because U.S. law blocks the kind of credit needed to ease those shipments.

Diplomacy
The U.S. and Cuba restored diplomatic relations and reopened embassies in Washington and Havana in 2015, after the U.S. removed Cuba from the U.S. list of state sponsors of terrorism. In January 2017, before leaving office, President Barack Obama eliminated the so-called “wet foot, dry foot” policy that allowed Cuban émigrés who reached U.S. soil without visas to stay in the country and apply for a green card after one year. Cuba supported that change in U.S. policy. All of the diplomatic changes will remain in place, under Mr. Trump’s directive.

However, some U.S. approaches will change. Last year the U.S. abstained for the first time from an annual United Nations vote on ending the embargo against Cuba, a shift from prior years. That’s likely to change this year, as Mr. Trump’s policy directive says that the U.S. should oppose efforts at the U.N. to end the embargo, until conditions change on the island.
Technology and TelecommunicationsThe Obama administration loosened regulations to try to foster more internet and telecommunications access on the island, including allowing American cellphone carriers to strike roaming agreements with Cuba’s state-run telecommunications monopoly, so that American phones work on the island. Google in April launched data servers in Cuba after signing an agreement with Cuba last December to place servers on the island and speed up internet access. The Trump administration’s policy shift will allow for the continuation of these kinds of actions and still aims to expand telecommunications and internet access on the island.
Finance and Remittances
The Obama administration removed caps on remittances Americans could send to the island, a change which will stay in force under Mr. Trump’s directive. The Obama administration also took steps to foster banking relationships between the U.S. and Cuba, expand the use of U.S. dollars and pave the way for American credit cards to work on the island, which will also stay the same.