惠誉评级：疲软的美国宏观经济环境导致五月份发行人违约事件增加。

Core Insights - The article highlights that the weak macroeconomic environment in the United States has led to an increase in default events among issuers in May [1] Group 1 - The macroeconomic conditions in the U.S. are described as weak, contributing to financial stress among issuers [1] - There has been a noticeable rise in the number of defaults reported in May, indicating a potential trend in the market [1] - The overall economic landscape is impacting the creditworthiness of various issuers, raising concerns for investors [1]