What is the beginning of the 20th century called?

On January 1, 1900, the twentieth century does not begin. Rather, this New Year’s Day begins the last year of the nineteenth century. The twentieth century begins on January 1, 1901. What was called the Christian Era — now called the Common Era to reflect the diversity of religions — began in the year 1.
 

What is the first half of the 20th century called?

THE FIRST HALF OF THE 20TH CENTURY – THE MODERN AGE (1901-1945 or 1952)

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