According to john Adams, happiness of a society is the end of the government.
However, not all nations are can be equally content with their governance. Happiness of people in the countries vary. Typically on various factors such as GDP per capita, social support, healthy life expectancy, freedom to make choices, generosity, trust and residual as per the World Happiness Report.
In July 2011, the UN General Assembly passed a resolution inviting member countries to measure the happiness of their people and to use this to help guide their public policies.
As of the 2017 report Norway is the overall happiest country in the world. Close behind are Denmark, Iceland and Switzerland in a tight pack. India is way below 121 countries, having poor ranking than its neighbours Pakistan (80) and Bangladesh (110).
Here is a story map of 12 happiest countries in the world.