Answer:
Yes, they can be considered precursors to subsequent anti-American actions in the Middle East, because they were likely perpetrated by Hezbollah, a Shia Islamist organization that operates in Lebanon, supported by Iran, and that is anti-American and Anti-Israel.
Step-by-step explanation:
The fact is that the United States has had a difficult relation with Iran ever since Ruhollah Khomeini came to power and founded the Iranian Islamic Republic. Hezbollah, as an ally of Iran, is also anti-American and as said before, was likely the perpetrator of the bombings.
Ever since, there have been many instances of Iran-led, or Hezbollah-led, attacks against Americans in the Middle-East, or against American insterests and allies. For this reason, the Beirub bombings can be considered a precursor of more recent confrontations.