Cross-Border Cultural Integration in M&A: What Have You Learned?

One of the toughest lessons we learned in cross-border integrations wasn’t systems or process alignment, but how bias and “status assumptions” can show up in day-to-day working norms.

In a mining industry integration at an American international company acquiring teams in Australia and South America, we staffed several workstreams with highly capable leaders, including women and South American workstream leads. All of the integration workstream leads were well versed and experienced in their given workstream discipline. Even with the right expertise and clear mandates, we saw early friction that wasn’t really about the work:

• In some meetings, leaders were talked over, interrupted, or their decisions were re-litigated after the fact.
• Requests that would typically be accepted when coming from certain “expected” voices were met with unnecessary challenges and pushback when coming from women or South American leaders.
• In a few cases, we saw more than informal workarounds. Local teams deviated from the agreed integration plan, kept parallel processes running, and sometimes presented updates as if they were aligned while coordinating separately to move in a different direction. That created execution risk and undermined accountability.

This was also one of the moments where we learned that physically being on-site and present mattered. When workstream leaders and senior sponsors were in-country with the teams, it was much easier to identify parallel efforts early, rebuild trust, clarify decision rights, and reset expectations on the operating model.
What also helped us turn the corner wasn’t a generic “be respectful” reminder. Leadership had to intervene in a few concrete ways:

1. Publicly reinforce decision rights and accountability.
Senior leadership explicitly stated (in integration-wide forums and in writing) who owned each workstream, what decisions they could make, and that bypassing them was not acceptable.
2. Model the behavior in real time.
When disrespect showed up (interruptions, side conversations, re-litigating decisions), leaders stepped in during the meeting: “Let’s pause. [Name] owns this workstream. We’ll follow their call, and if there’s a concern, it goes through the escalation path.”
3. Prepare workstream leads for predictable cultural dynamics.
We coached leaders on how to handle pushback without getting pulled into repeated justification loops, how to use structured decision artifacts (one-pagers, decision logs), and how to escalate early before the behavior became normalized.
4. Educate the acquired teams on the integration operating model (and why).
We ran a short “how we work together” onboarding: escalation paths, meeting norms, decision-making, and expectations around inclusion. The message wasn’t “change your culture.” It was “here’s how we’ll operate during integration so decisions are fair, fast, and consistent.”
5. Create a safe path to surface issues.
We gave workstream leaders a channel to flag problems (e.g., recurring bypassing, disrespect, noncompliance) and treated them as integration risks, because they were.

Over time, the operating model improved. Importantly, we didn’t just “solve conflict.” We ended up with a stronger approach that blended strengths: Australia’s directness and pragmatic execution, South America’s relationship-building and context awareness, and clearer governance from the U.S. side.

Curious if others have seen similar “authority/bias” dynamics during cross-border integration, and what interventions actually worked beyond generic culture training.