The Wolfram Language has built-in access to an extensive collection of continually updated data on people and many kinds of history. Free-form linguistics provide a convenient mechanism for accessing all available data; more common categories also have specific associated Wolfram Language functions.
EntityValue — general access to values of properties for all types of entities
WikipediaData — Wikipedia material about entities and other topics
PersonData — data on hundreds of thousands of current and historical figures
SocialMediaData — data on Facebook friends, Twitter followers, etc.
WordFrequencyData — historical usage data for words and -grams
CountryData — historical demographics, economics, etc. for all countries
CityData — historical demographics, founding dates, etc.
InflationAdjust — historical inflation adjustment
HistoricalPeriodData — data on notable historical periods
FinancialData — extensive historical data on stocks, companies, etc.
CurrencyConvert — historical currency conversion rates
DateObject — represent and convert Gregorian, Julian, Jewish, etc. dates
WeatherData — complete worldwide historical weather records