Tuvalu
constitutional monarchy with a parliamentary democracy
Uganda
republic
Ukraine
republic
United Arab Emirates
federation with specified powers delegated to
the UAE federal government and other powers reserved to member
emirates
United Kingdom
constitutional monarchy
United States
Constitution-based federal republic; strong democratic
tradition
Uruguay
constitutional republic
Uzbekistan
republic; authoritarian presidential rule, with little
power outside the executive branch
Vanuatu
parliamentary republic
Venezuela
federal republic