From History Vault:
Unlock the HISTORY Vault to explore the greatest stories in history. Access hundreds of hours of curated historical content for only $4.99 per month. Start your 7-day free trial now and get commercial free video with no TV provider needed.
You can add HISTORY VAULT to your Roku here: https://channelstore.roku.com/details/81920/history-vault#read-more
You can add HISTORY VAULT to your Fire TV here: http://amzn.to/1TWqccL
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Source: Cord Cutters News