Final answer:
The spread of domestic terrorism was facilitated by improved recruitment methods, civilian unrest, and colonial groups seeking independence.
Explanation:
Improved methods for recruiting new members contributed to the spread of domestic terrorism by allowing terrorist groups to expand their reach and influence. Civilian unrest due to government-enforced restriction also played a role as it fueled grievances and radicalization within populations. Additionally, colonial groups seeking independence from imperial powers often resorted to terrorist tactics as part of their liberation struggles.
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