15 Countries Containing an Unknown Letter #2

There are 15 countries below - all of which have one letter in common. Can you figure it out?
To make sure you know the answer, name a World Capital beginning with the unknown letter.
These are not neccessarily the only 15
Quiz by Quizzer6794
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Last updated: October 7, 2016
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First submittedOctober 7, 2016
Times taken563
Average score56.3%
Rating3.71
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Country
Kazakhstan
Belize
Zimbabwe
Swaziland
Czech Republic
Country
Uzbekistan
Brazil
Azerbaijan
Switzerland
Mozambique
Country
New Zealand
Zambia
Bosnia & Herzegovina
Venezuela
Tanzania
World Capital
Zagreb
 
Secret Letter
Z
+2
Level 87
Oct 7, 2016
missed Kyrgyzstan
+1
Level 80
Oct 7, 2016
agreed - otherwise good quiz
+1
Level 52
Aug 9, 2023
apart from kyrgyzstan missing, swaziland is no longer called swaziland, but eswatini for the most part