from typing import List
from typing import Dict


def aggregate_action_stats(action_stats: List[Dict[str, int]]) -> Dict[str, int]:
    """Aggregate statistics by returning largest value observed for each of the tweet reactions (reply, retweet, favorite)."""
    action_stat = {}
    for key in action_stats[0].keys():
        counts = [count[key] for count in action_stats]
        action_stat[key] = max(counts)
    return action_stat