Internet freedom declined in both the United States and Germany as Western democracies joined authoritarian states in imposing growing restrictions online, an annual survey by Freedom House said Thursday.

The Washington-based democracy promotion research group said global internet freedom fell for the 15th straight year, with declines in a number of countries that remain classified as "free."

"We find worsening repression in authoritarian and authoritarian-leaning states, largely because governments in those countries see restrictions on the internet and online expression as a means of maintaining power," said Kian Vesteinsson, the report's co-author.