the ____protected nepal and bhutan from outside influences until 1900's
Probably the Himalayas, but check maps to be sure.
http://library.thinkquest.org/10131/maps.shtml
The "Treaty of Sinchula" protected Nepal and Bhutan from outside influences until the 1900s.
To find this answer, you can follow these steps:
1. Start by conducting a basic search using a search engine or an online encyclopedia. For example, you can search for "protection of Nepal and Bhutan from outside influences until 1900s."
2. Look for reliable sources such as academic articles, official government websites, or reputable historical sources.
3. As you browse through the search results, pay attention to the information provided in titles, snippets, or short descriptions of the sources. These can give you a general idea of what the sources contain.
4. Click on the most relevant sources to gather detailed information. Look for specific information about treaties or agreements that may have protected Nepal and Bhutan during that period.
5. Once you find information related to the protection of Nepal and Bhutan until the 1900s, cross-reference the information from multiple sources to ensure its accuracy and reliability.
6. Based on the information gathered, identify the specific treaty or agreement that provided protection to Nepal and Bhutan from outside influences until the 1900s. It is in this case, the Treaty of Sinchula.