input: from typing import List
  
  def findGCD(numbers: List[int]) -> int:
      """ Find the greatest common divisor (GCD) of a list of integers.
      This function utilizes the Euclidean algorithm to recursively find the GCD of two numbers.
      Subsequently, it continues to find the GCD of the result with the next number in the list.
      The computation uses modulo operations for efficiency.
      
      >>> findGCD([1000, 500])
      500
      >>> findGCD([72, 120, 18])
      6
      """
      def gcd(x, y):
          if y == 0:
              return x
          return gcd(y, x % y)
      
      if len(numbers) < 2:
          raise ValueError("At least two numbers are required to find GCD.")
      current_gcd = numbers[0]
      for num in numbers[1:]:
          current_gcd = gcd(current_gcd, num)
          if current_gcd == 1:  # GCD for all numbers is 1 if their pairwise GCD is 1
              return 1
      return current_gcd
output:     if len(numbers) < 2:
          raise ValueError("At least two numbers are required to find GCD.")
      current_gcd = numbers[0]
      for num in numbers[1:]:
          current_gcd = gcd(current_gcd, num)
          if current_gcd == 1:  # GCD for all numbers is 1 if their pairwise GCD is 1
              return 1
      return current_gcd