This article draws on border studies that recognise rebordering practices as ongoing performances of conflict between various actors including state authorities, border security agents, migrants, migrant supporters, smugglers, international organisations, lawyers, advocates and others. We draw attention to variable levels of intensity with which these conflicts are performed and the impact they have on migrants' ability to exercise their agency. We understand intensity to mean not merely the emotional discursive environment in which these conflicts unfold, and the pressure tactics used by at least some parties, but, more importantly, the speed of the responses by all actors involved in this border performance. Focusing on rebordering practices at the US–Mexico borderlands in 2018 and 2019 adopted in response to new forms of mobility, we characterise these years as a period of high intensity, when rapidly changing policies provoked immediate responses by migrants, and equally speedy counter-responses by other actors, particularly the US and Mexican administration. We suggest that the volatile architecture of border control in the US–Mexico borders has rendered many strategies employed by Central American migrants to overcome obstacles and create innovative solutions virtually ineffective. The article is based on an ethnographic study carried out between early May and mid-August 2019 in Mexico.

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强度和不确定性：在美墨边境上演边境冲突

本文借鉴了边境研究，这些研究承认重新边境实践是包括国家当局、边境安全人员、移民、移民支持者、走私者、国际组织、律师、倡导者和其他人在内的各种行为者之间持续冲突的表现。我们提请注意不同的强度水平这些冲突的表现以及它们对移民行使代理权的能力的影响。我们理解的强度不仅意味着这些冲突展开的情感话语环境，以及至少某些方面使用的压力策略，而且更重要的是，参与这场边界表演的所有参与者的反应速度。专注于 2018 年和 2019 年美国和墨西哥边境地区为应对新形式的流动而采取的重新边界做法，我们将这些年描述为一个高强度时期，当时快速变化的政策引起了移民的立即反应，并且同样迅速地做出了反击其他参与者，特别是美国和墨西哥政府。我们认为，美国和墨西哥边境的边境管制架构不稳定，导致中美洲移民为克服障碍和创造创新解决方案而采用的许多策略几乎无效。这篇文章基于 2019 年 5 月初至 8 月中旬在墨西哥进行的一项民族志研究。