Economic and political cycles of 30 years during a time period of 150 years.
1868 War of independence begins
1898 End of war
1928 Great Depression
1958 F, Castro
1988 Perestroika and Glasnost
2018 ..........Probability of repeating the cycle is 80 %
Crisis were caused by countries with close political and economic relationship to Cuba in the future the countries responsible for the next crisis will be Venezuela and / or the U.S.