HAVANA — Cubans overwhelmingly expect detente with the United States to alter their widely disliked economic system, according to a rare poll of 1,200 people across the island.

The poll released Wednesday found less optimism about Cuba’s political future, with 54 percent saying the single-party government would not change as a result of closer ties. The poll found that 53 percent of Cubans are dissatisfied with the political system and 52 percent want more than one political party.

Eggs are sold in Havana. Of Cubans polled, 97 percent said normalization with the U.S. was good for Cuba.

The poll also found that 97 percent of those interviewed thought normalization with the U.S. was good for Cuba and that while 55 percent want to emigrate from Cuba, 73 percent feel optimistic about the future.

Seventy-nine percent of those polled over 10 days last month by the Miami-based polling firm Bendixen & Amandi on behalf of The Washington Post and Univision Noticias/Fusion said they were not satisfied with Cuba’s centrally planned economy. But 64 percent said they expected that system to change because of the decision late last year to re-establish diplomatic ties between the countries and move toward normalization. The poll, which Bendixen & Amandi call the most comprehensive measure of Cuban public opinion in decades, did not break down the ways in which respondents expected it to change.

The results show the limits of a Cuban effort to lower expectations of better lives because of the Dec. 17 announcement by presidents Obama and Raul Castro. Most Cubans were elated by the announcement and Obama’s loosening of restrictions on trade. Many said it removed their government’s ability to blame a stagnant economy and widespread shortages of basic goods on a half-century of U.S. isolation.

The government swiftly filled official media with repeated reminders that a U.S. trade embargo remains in place. Castro and lower-ranking officials also warned the U.S. not to expect any changes in Cuba’s single-party system.

Eighty percent of Cubans surveyed in the new poll had positive opinions of Obama, while 47 percent had positive opinions of Raul Castro. Regional polls show a similar pattern, with Obama more popular than local leaders in many Latin countries.

Cuban media do not conduct polls using internationally accepted standards and unauthorized polling by foreign media or nongovernmental organizations is illegal and extremely unusual.

Bendixen & Amandi vetted and trained locally hired poll-takers and sent them door-to-door in 13 of Cuba’s 15 provinces, checking their data after it was collected to make sure it was accurate and representative, managing director Fernand Amandi said Wednesday. The poll had a margin of error of 2.8 percentage points.

Bendixen said he was pleasantly surprised by their openness. “We actually found them to be very candid, very frank.”

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