havana cubans say crestfallen return era frosty relations unite state news spread u.s. president donald trump set revert part historic detente cuba trump friday announce plan tighten rule americans travel communist-run cuba significantly restrict u.s. firm business cuban enterprises control military white house officials say hurt go backwards roll back engagement manage isolate us world say havana resident marta deus try tune trump speech miami heartland cuban exile deus recently set accountancy firm courier service cater private sector flourish since landmark agreement two half years ago former u.s. president barack obama cuban leader raul castro normalize relations former cold war foes need clients business need economy move isolate cuba manage hurt many cuban families force company close say 2014 deal spark widespread euphoria cuba raise hop improvement ail economy increase arrival u.s. tourists thank ease restrictions fuel boom tourism especially havana create demand bnbs restaurants taxis tour guide fledgling private sector critics say open fail improve right island trump justify partial reversal obama measure large extent ground white house officials say cuban dissidents back tough stance say repression worsen since detente cuban authorities step detentions activists often confiscate telephone laptops also come heavy hand self- employ cubans appear empower obama administration stop condemn human right violations cuba regime say look nothing happen continue repress forcefully say jose daniel ferrer lead patriotic union cuba country large dissident group ferrer say group 53 activists currently imprison due political view dissidents agree repression worsen say roll back detente hurt ordinary cubans solution probably benefit term human right say eliecer avila leader opposition youth group somos mas cuban government withstand u.s. trade embargo half century make political concessions unite state due economic pressure say carlos alzugaray retire cuban diplomat concern affect private sector quite bite much cuban government say without doubt impact tourism industry benefit threefold increase u.s. visit last two years although unclear much go really hurt majority clients unite state say enrique montoto 61 rent room u.s. online home-rental marketplace airbnb expand cuba 2015 things go pot tighten belt new setback cuban economy come time already wrestle fall oil shipments crisis-stricken ally venezuela decline export another blow cubans hurt pocket obviously say martha garcia 51 unite state tranquility cubans say crestfallen trump roll back detente