Related Clues:

• Introduced, with 'to'
• Helped cause, with "to"
• Prepared the way
• ___ to (brought on)
• Laid the foundation for, with "to"
• Prepared the way (to)
• Preceded, with 'to'
• Was a prelude (to)
• Introduced, with "to"
• Was preliminary (to)
• ___ to (preceded)
• Preceded (with "to")
• Was a prelude